:root {
  /* common start*/
  /* common end */
  /* head start */
  --top-head-height: 50px;
  --tags-view-height: 35px;
  /* head end */
  /* logo start */
  --logo-height: var(--top-head-height);
  /* logo end */
  /* left menu start */
  --left-menu-max-width: 200px;
  --left-menu-min-width: 64px;
  --left-menu-height: var(--left-menu-min-width);
  /* left menu end */
  /* content start*/
  --app-content-padding: 20px;
  --app-footer-height: 50px;
  /* content end*/
  --transition-time-02: 0.2s;
}
* {
  margin: 0;
  padding: 0;
}
